Photoplethysmography is spectrophotometric technique used to calculate vital parameters. It is a promising technology due to its simplicity, low cost, and noninvasiveness and it has the potential for early screening for various atherosclerotic and cardiac pathologies. Although this technology has been used in pulse oximetry for the past 40 years, much research and innovation are still related to this topic. This is due to the recent widespread use of wearable devices that constantly monitor vital parameters. Particularly in the last two years, the use of these devices has increased significantly, especially for home applications, due to the Covid-19 pandemic. It is because of the growing interest in learning more about this technology and acquiring more knowledge about the world of biomedical instrumentation, which involves an inevitable combination of electronics and biomedicine, that this thesis project was born.